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Additional Balance Sheet Information (Notes)
 9 Months Ended
Apr. 30, 2020
Additional Balance Sheet Information [Abstract]  
Supplemental Balance Sheet Disclosures [Text Block] Additional Balance Sheet Information
Inventories
Inventories as of April 30, 2020, and July 31, 2019, consisted of the following:

 April 30, 2020July 31, 2019
Finished products$77,634  $77,532  
Work-in-process22,819  20,515  
Raw materials and supplies24,122  21,990  
Total inventories$124,575  $120,037  
Property, plant and equipmentProperty, plant and equipment is presented net of accumulated depreciation in the amount of $279,757 and $273,880 as of April 30, 2020, and July 31, 2019, respectively.